This is closely related to the migration of ar71xx → ath79. See also ar71xx, ath79 and ar71xx-ath79
What does it mean, “ath79 wip”?
What is the reason for this status?
What consequences does this have in regards to your expectations?
Expectation: Fully working device after migrating from ar71xx → ath79 without any changes in your configuration (network, wifi, ...)
Reality: After migrating from ar71xx → ath79, you need to adjust your configuration (network, wifi, ...)
Will this status change over time? If yes, in what timeframe?
What can you do now?
Where can you find more information about current support status?